US9623488B2 - Drill and method of manufacturing machined product - Google Patents
Drill and method of manufacturing machined product Download PDFInfo
- Publication number
- US9623488B2 US9623488B2 US13/690,640 US201213690640A US9623488B2 US 9623488 B2 US9623488 B2 US 9623488B2 US 201213690640 A US201213690640 A US 201213690640A US 9623488 B2 US9623488 B2 US 9623488B2
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- United States
- Prior art keywords
- cutting edges
- rake
- cutting
- drill
- outer peripheral
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/009—Stepped drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
- B23B2228/36—Multi-layered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/48—Chip breakers
-
- B23B2251/54—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0411—Drills for trepanning with stepped tubular cutting bodies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/03—Processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
- Y10T408/906—Axially spaced
Definitions
- the present invention relates to a drill and a method of manufacturing a machined product.
- a step drill As a drill capable of forming, at a time, a stepped hole in which a diameter is varied in midstream and a chamfered hole whose opening is chamfered, a step drill is known (see JP 2007-7831 A for example).
- a conventional step drill described in JP 2007-7831 A has a problem that discharging performance of chip is inferior. Hence, if a through hole is formed using the conventional step drill, the through hole is prone to be clogged with produced chip, and there is a problem that an inner wall surface of the through hole is damaged or a cutting edge becomes fractured.
- a drill according to an embodiment of the present invention including a substantially cylindrical cutting portion includes a first region located at a front end portion, and a second region which has a step whose diameter increases as going from the first region to a rear end in a sectional view perpendicular to a rotation axis, and which is continuous with the first region in an end of the second region on a side of the step, wherein the first region includes a plurality of first cutting edges located at a front end, a first outer peripheral portion located at an outer peripheral portion of the cutting portion, and a plurality of first flutes spirally located in the first outer peripheral portion from rear ends of the plurality of first cutting edges toward the rear end of the cutting portion, the second region includes a plurality of second cutting edges located at the step, a second outer peripheral portion located at the outer peripheral portion of the cutting portion, a plurality of second flutes spirally located in the second outer peripheral portion from rear ends of the plurality of second cutting edges toward the rear end of the cutting portion, and a plurality of second rake surfaces
- a method of manufacturing a machined product includes rotating the drill; bringing the plurality of second cutting edges of the drill being rotated and a workpiece into contact with each other; and relatively separating the workpiece and the drill from each other.
- each of the second rake surfaces located on the side of the rear ends of the plurality of second cutting edges located on the step includes the second central surface and the second outward surface located closer to the second outer peripheral portion than the second central surface.
- the length W 2 of the second rake surface in the direction parallel to the rotation axis decreases as going to the second outer peripheral portion.
- the length W 2 of the second rake surface increases as going to the second outer peripheral portion. Therefore, the end of the second flute located on the side of the second cutting edge has a convex shape projecting toward the second cutting edge as approaching the boundary between the second central surface and the second outward surface.
- a working method in which a prepared hole having a diameter smaller than that of a desired hole is formed in a workpiece, and a desired diameter is formed from above the prepared hole. From a viewpoint of compensation of the power shortage, it is preferable that the prepared hole is penetrated, but the prepared hole may not be penetrated.
- the drill according to the embodiment of the invention has excellent chip-discharging performance due to the above-described reason. Therefore, when a through hole is formed, it is possible to prevent the hole which is being formed from being clogged with chip produced.
- the invention is applied to a hand drill for example, a working step for a prepared hole can be omitted, the producing cost can be reduced, and it is possible to avoid generation of variation in quality caused by a mix-up between a diameter of a prepared hole based on the first cutting edge and a finally worked diameter based on the second cutting edge.
- FIG. 1 is a side view showing a drill according to an embodiment of the present invention
- FIG. 2 is an enlarged view of a front end of the drill shown in FIG. 1 ;
- FIGS. 3A and 3B are partially enlarged side views of a vicinity of a front end portion of the drill shown in FIG. 1 as viewed from different directions;
- FIG. 4 is a partially enlarged explanatory diagram showing the vicinity of the front end portion of the drill shown in FIG. 1 ;
- FIGS. 5A to 5C are explanatory diagrams showing a method of manufacturing a machined product according to the embodiment of the invention in order of steps;
- FIG. 6 is a partially enlarged side view showing a vicinity of a front end portion of a drill according to another embodiment of the invention.
- FIG. 7 is an explanatory diagram showing a method of manufacturing a machined product according to another embodiment of the invention.
- FIGS. 1 to 4 A drill according to an embodiment of the present invention will be described in detail using FIGS. 1 to 4 .
- a drill 1 of the embodiment can rotate around a rotation axis S in a direction of an arrow A, and includes a shank portion 2 and a cutting portion 3 in this order from its base end.
- the shank portion 2 is grasped by a rotation shaft of a machine tool, and is located at the base end of the drill 1 .
- Examples of the machine tool which grasps the shank portion 2 are a hand drill and a machining center, and especially the hand drill is preferable.
- the cutting portion 3 comes into contact with a workpiece, and is located on a side of one end of the shank portion 2 .
- the cutting portion 3 of the embodiment is substantially cylindrical in shape, and includes a first region 10 located at a front end portion of the drill 1 , and a second region 20 which is continuous with the first region 10 .
- the first region 10 includes a plurality of first cutting edges 11 located on the tip end of the drill 1 , a first outer peripheral portion 12 located at the first region 10 of an outer peripheral portion 31 of the cutting portion 3 , and a plurality of first flutes 13 spirally located in the first outer peripheral portion 12 extending from rear ends of the first cutting edges 11 toward a rear end of the cutting portion 3 , i.e., toward the shank portion 2 .
- the plurality of first cutting edges 11 are located at distances from one another symmetrically with respect to the rotation axis S in a front end view.
- the term “in a front end view” means that the drill 1 is viewed from the front end portion of drill 1 .
- the number of the first cutting edges 11 is three, and the three first cutting edges 11 are located in a rotationally symmetric relation with respect to the rotation axis S at 120° intervals from one another as viewed from the front end. According to this configuration, it is possible to enhance a straight travelling stability of the drill 1 when a workpiece is machined.
- the number of the first cutting edges 11 is not limited to three, and the number can usually freely be selected from a range from two to five.
- an angle ⁇ 1 formed between phantom extension lines L 1 and L 2 of a pair of first cutting edges 11 a and 11 b (not shown) of the plurality of first cutting edges 11 which are most separated from each other is an obtuse angle in a view from a direction perpendicular to the rotation axis S. According to this angle, it is possible to enhance the operability of the drill 1 and biting performance of the drill 1 into a workpiece.
- a preferable value of the angle ⁇ 1 is about 100 to 140°.
- Chips produced from the plurality of first cutting edges 11 are discharged to a rear end of the cutting portion 3 through the plurality of first flutes 13 .
- the plurality of first flutes 13 are located corresponding to the plurality of first cutting edges 11 . Therefore, the number of the plurality of first flutes 13 is the same as the number of the plurality of first cutting edges 11 .
- three first flutes 13 are located corresponding to three first cutting edges 11 .
- the plurality of first flutes 13 of the embodiment are separated from one another over an entire length of the first region 10 .
- Each of the plurality of first flutes 13 has a helix angle ⁇ 1 (not shown).
- the helix angle ⁇ 1 means an angle formed between the first flute 13 and the rotation axis S when the drill 1 is viewed from a position where an end of one of the first cutting edges 11 that is located on the side of the first outer peripheral portion 12 is the highest.
- the high position means a high position in a radial direction which is perpendicular to the rotation axis S of the drill 1 .
- a preferable value of the helix angle ⁇ 1 is about 10 to 45°.
- the first region 10 of the embodiment further includes a biting portion 15 located on the front end of the drill 1 at a location on the side of the rotation axis S.
- the biting portion 15 enhances the biting performance into a workpiece, and is formed by thinning a chisel-edge to reduce its thickness.
- the chisel-edge means a portion formed by intersecting, with each other, ends of the plurality of first cutting edges 11 located on the side of the rotation axis S.
- the biting portion 15 is constituted by thinning the chisel-edge such that the chisel-edge does not remain. All of the first cutting edges 11 are continuous with the biting portion 15 .
- the thinning operation is not limited to the manner in which the chisel-edge does not remain, and a portion of the chisel-edge may remain depending upon composition of a workpiece and a cutting condition.
- the first region 10 of the embodiment further includes first flank faces 16 located rearward of the first cutting edge 11 in the rotation direction A of the drill 1 .
- Each of the first flank faces 16 avoids contact with a workpiece and functions to reduce a cutting resistance, and has a predetermined clearance angle.
- the clearance angle of the first flank face 16 means an angle formed between the first flank face 16 and a reference surface (not shown) which is perpendicular to the rotation axis S.
- a preferable value of the clearance angle of the first flank face 16 is about 5 to 20°.
- the first region 10 of the embodiment further includes first margins 17 located in regions of the first outer peripheral portion 12 where there is no first flute 13 .
- Each of the first margins 17 comes into slide contact with an inner wall surface of a machining hole when a workpiece is cut by the first cutting edge 11 and enhances the operability of the drill 1 .
- the second region 20 includes a step 25 .
- a diameter of the step 25 increases as going from the first region 10 to a rear end of the second region 20 in a sectional view perpendicular to the rotation axis S.
- an end 20 a of the second region 20 on the side of the step 25 is continuous with the first region 10 , and the diameter of the end 20 a is greater than that of the first region 10 .
- the second region 20 includes a plurality of second cutting edges 21 located on the step 25 , a second outer peripheral portion 22 located in the second region 20 on the outer peripheral portion 31 , and a plurality of second flutes 23 spirally located in the second outer peripheral portion 22 from rear ends of the plurality of second cutting edges 21 toward a rear end of the cutting portion 3 .
- the plurality of second cutting edges 21 are located at predetermined distances from one another in a rotationally symmetric relation with respect to the rotation axis S in a front end view. More specifically, in this embodiment, as shown in FIG. 2 , the number of the second cutting edges 21 is three, and the three second cutting edges 21 are located rotationally symmetric at 120° intervals from one another with respect to the rotation axis S in a front end view. According to this configuration, it is possible to enhance the straight travelling stability when a workpiece is machined.
- the number of the plurality of second cutting edges 21 is three. According to this configuration also, it is possible to enhance the straight travelling stability when a workpiece is machined.
- the number of the second cutting edges 21 is not limited to three, and the number can usually freely be selected from a range from two to five.
- the numbers of the first cutting edges 11 and the second cutting edges 21 need not be the same, and the numbers may be different from each other depending upon composition of a workpiece and a cutting condition.
- an angle ⁇ 2 formed between phantom extension lines L 3 and L 4 of a pair of second cutting edges 21 a and 21 b of the plurality of second cutting edges 21 which are most separated from each other is an obtuse angle in a view from a direction perpendicular to the rotation axis S.
- a preferable value of the angle ⁇ 2 is about 100 to 140°.
- the angles ⁇ 1 and ⁇ 2 need not be the same, and they may be different from each other depending upon composition of a workpiece and a cutting condition.
- all of the second cutting edges 21 are shorter than the plurality of first cutting edges 11 .
- all of the plurality of first cutting edges 11 are longer than the plurality of second cutting edges 21 .
- a circumferential velocity of the second cutting edge 21 is relatively fast and the second cutting edge 21 is prone to receive a load but according to the above-described configuration; however, it is possible to restrain the second cutting edge 21 from becoming fractured.
- All of chips produced from the plurality of second cutting edges 21 are discharged toward the rear end of the cutting portion 3 through the plurality of second flutes 23 .
- the plurality of second flutes 23 are located corresponding to the plurality of second cutting edges 21 . Therefore, the number of the plurality of second flutes 23 is the same as that of the plurality of second cutting edges 21 .
- three second flutes 23 are located respectively corresponding to three second cutting edges 21 .
- the plurality of second flutes 23 of this embodiment are separated from one another over an entire length of the second region 20 .
- all of the second flutes 23 are continuous from the corresponding first flutes 13 , respectively. According to this configuration, it is possible to collectively discharge chip produced from the first cutting edges 11 and the second cutting edges 21 toward the rear end of the cutting portion 3 .
- the first flutes 13 and the second flutes 23 need not continuous with each other, and they may be separated from each other depending upon composition of a workpiece and a cutting condition.
- all of the plurality of second flutes 23 have helix angles ⁇ 2 .
- the helix angle ⁇ 2 means an angle formed between the second flute 23 and the rotation axis S when the drill 1 is viewed from a position where an end of the second cutting edge 21 on the side of the second outer peripheral portion 22 becomes the highest.
- a preferable value of the helix angle ⁇ 2 is about 10 to 45°.
- the helix angles ⁇ 1 and ⁇ 2 need not be the same, and they may be different from each other depending upon composition of a workpiece and a cutting condition.
- the second region 20 of this embodiment further includes second flank faces 26 located rearward of the second cutting edge 21 in the rotation direction A of the drill 1 .
- each of the second flank faces 26 avoids contact with a workpiece and functions to reduce a cutting resistance, and has a predetermined clearance angle.
- the clearance angle of the second flank face 26 means an angle formed between the second flank face 26 and a reference surface (not shown) which is perpendicular to the rotation axis S.
- a preferable value of the clearance angle of the second flank face 26 is about 5 to 20°.
- the second region 20 of the embodiment further includes second margins 27 and clearances 28 in regions of the second outer peripheral portion 22 where there is no second flute 23 .
- each of the second margins 27 comes into slide contact with an inner wall surface of a machining hole when a workpiece is cut to enhance the operability of the drill 1 .
- Each of the clearances 28 is located rearward of the second margin 27 in the rotation direction A of the drill 1 . From a viewpoint of reduction in cutting resistance, a diameter of the clearance 28 is smaller than that of the second margin 27 in a sectional view perpendicular to the rotation axis S.
- the second region 20 of the embodiment further includes a plurality of second rake surfaces 24 located between the plurality of second cutting edges 21 and the plurality of second flutes 23 .
- the plurality of second rake surfaces 24 stabilize a discharging direction of chip produced from the second cutting edge 21 , secure the strength of the second cutting edge 21 , and restrain the second cutting edge 21 from becoming fractured.
- Each of the plurality of second rake surfaces 24 includes a second central surface 241 and a second outward surface 242 .
- a length W 2 of the second rake surface 24 in a direction parallel to the rotation axis S decreases as going to the second outer peripheral portion 22 .
- the second outward surface 242 is located closer to the second central surface 241 than the second outer peripheral portion 22 . In the second outward surface 242 , the length W 2 of the second rake surface 24 increases as going to the second outer peripheral portion 22 .
- a shape formed by a boundary 241 a between the second central surface 241 and the second flute 23 and a boundary 242 a between the second outward surface 242 and the second flute 23 becomes a convex shape projecting toward the second cutting edge 21 . That is, an end 23 a of the second flute 23 located on the side of the second cutting edge 21 has a convex shape projecting toward the second cutting edge 21 as approaching a boundary P 1 between the second central surface 241 and the second outward surface 242 .
- the chip pass through the second rake surface 24 and the end 23 a of the second flute 23 at the same time.
- a part of the chip which pass through the second flute 23 located in the vicinity of the end 23 a is curved along the shape of the second flute 23 , and widths of the chip become smaller than the length of the second cutting edge 21 .
- the end 23 a is curved in a convex form projecting toward the second cutting edge 21 as approaching the boundary P 1 as in this embodiment. By forming the end 23 a into the curved shape, further smooth discharging property of chip can be exerted.
- the boundary P 1 between the second central surface 241 and the second outward surface 242 is located closer to the second outer peripheral portion 22 than a midpoint P 2 of the second cutting edge 21 . According to this configuration, it is possible to stabilize the discharging direction of chip produced from the second cutting edge 21 , and it becomes easy to curve the chip along the shape of the second flute 23 .
- each of the plurality of second rake surfaces 24 has a rake angle ⁇ 2 .
- the rake angle ⁇ 2 means an angle formed between the second rake surface 24 and the rotation axis S when the drill 1 is viewed from a position where the end of the second cutting edge 21 located on the side of the second outer peripheral portion 22 becomes the highest.
- the rake angle ⁇ 2 is preferably in a range of about 0 to 10°, and more preferably in a range of 3 to 7°.
- the rake angle ⁇ 2 is determined based on a condition that rearward inclination in the rotation direction A of the drill 1 is defined as positive, and forward inclination in the rotation direction A is defined as negative.
- the rake angle ⁇ 2 of the embodiment is a positive rake angle.
- the rake angle ⁇ 2 and the helix angle ⁇ 2 of the embodiment have a relation of ⁇ 2 ⁇ 2 . According to this configuration also, like the effect exerted by the boundary P 1 , it is possible to stabilize the discharging direction of chip produced from the second cutting edge 21 , and to make it easy to curve the chip along the shape of the second flute 23 .
- the first region 10 also further includes a plurality of first rake surfaces 14 located between the plurality of first cutting edges 11 and the plurality of first flutes 13 like the second region 20 .
- each of the first rake surfaces 14 includes a first central surface 141 and a first outward surface 142 .
- a length W 1 of the first rake surface 14 in a direction parallel to the rotation axis S decreases as going to the first outer peripheral portion 12 .
- the first central surface 142 is located closer to the first outer peripheral portion 12 than the first central surface 141 .
- the length W 1 of the second rake surface 24 increases as going to the first outer peripheral portion 12 . Therefore, from the same reason as that described concerning the second rake surface 24 , chip produced from the first cutting edge 11 smoothly pass through the first flute 13 and discharging property of chip can further be enhanced.
- each of the plurality of first rake surfaces 14 includes a first inward surface 143 which is located closer to the rotation axis S than the first central surface 141 .
- the length W 1 of the first rake surface 14 increases as going to the first outer peripheral portion 12 . According to this configuration, it is possible to stabilize the discharging direction of chip produced from the first cutting edge 11 , and it becomes easy to curve the chip along the shape of the first flute 13 .
- Each of the plurality of first rake surfaces 14 includes a rake angle ⁇ 1 (not shown).
- the rake angle ⁇ 1 is an angle formed between the first rake surface 14 and the rotation axis S when the drill 1 is viewed from a position where an end of the first cutting edge 11 located on the side of the first outer peripheral portion 12 becomes the highest.
- the rake angle ⁇ 1 is preferably in a range of about 0 to 10°, and more preferably in a range of 3 to 7°.
- the rake angle ⁇ 1 of the embodiment is a positive rake angle.
- the rake angle ⁇ 1 and the helix angle ⁇ 1 of the embodiment have a relation of ⁇ 1 ⁇ 1 . According to this configuration also, it is possible to stabilize the discharging direction of chip produced from the first cutting edge 11 , and to make it easy to curve the chip along the shape of the first flute 13 .
- the rake angles ⁇ 1 and ⁇ 2 need not be the same, and they may be different from each other depending upon composition of a workpiece and a cutting condition.
- the cutting portion 3 of the embodiment further includes a third region 30 in addition to the first region 10 and the second region 20 .
- the third region 30 is continuous with the second region 20 .
- the third region 30 is designed in accordance with a shape of the shank portion 2 and the depth of a through hole to be formed.
- the drill 1 is first rotated in the direction of the arrow A around the rotation axis S.
- the drill 1 is sent in a direction of an arrow B, the plurality of first cutting edges 11 , the plurality of second cutting edges 21 of the drill 1 and a workpiece 100 are brought into contact with each other, thereby forming a through hole 101 . Due to the above-described reason, since the drill 1 has excellent discharging property of chip, it is possible to prevent the through hole 101 from being clogged with chip produced when forming the through hole 101 , and it is possible to form the through hole 101 having excellent working precision while restraining the first cutting edge 11 and the second cutting edge 21 from becoming fractured.
- the workpiece 100 is a laminate formed by laminating, on each other, at least two kinds of layers selected from a carbon fiber reinforced plastic layer, a titanium layer and an aluminum layer. Such a workpiece 100 is used as constituent members of airplanes for example.
- the drill 1 is pulled out from the through hole 101 in a direction of an arrow C, the workpiece 100 and the drill 1 are relatively separated from each other.
- the present invention is not limited to the above-described embodiment, and the invention can variously be modified and changed within a range of the invention of course.
- the first region 10 includes the plurality of first rake surfaces 14 located between the plurality of first cutting edges 11 and the plurality of first flutes 13 .
- all of the plurality of first flutes 13 may be continuous with the plurality of first cutting edges 11 .
- it is preferable that a portion of the first flute 13 located on the side of the first cutting edge 11 has the same configuration as that of the first rake surface 14 .
- Other configuration is the same as that of the drill 1 of the above-described embodiment.
- the second rake surface 24 may also include a second inward surface. That is, each of the second rake surfaces 24 may include a second inward surface which is located closer to the rotation axis S than the second central surface 241 and in the second inward surface, the length W 2 of the second rake surface 24 increases as going to the second outer peripheral portion 22 . According to this configuration, when the length of the second cutting edge 21 is relatively long, it is possible to stabilize the discharging direction of chip produced from the second cutting edge 21 , and to make it easy to curve the chip along the shape of the second flute 23 . Other configuration is the same as that of the drill 1 of the embodiment.
- the ends 23 a of the second flutes 23 are located between the second cutting edges 21 at predetermined intervals in the embodiment. Instead of this configuration, a portion of the end 23 a may be located such that it is in contact with the second cutting edge 21 . According to this configuration, sharp performance is enhanced and in addition to this, a chip-involving effect can further be enhanced.
- Other configuration is the same as that of the drill 1 of the above-described embodiment.
- the biting portion 15 is provided by thinning the chisel-edge in the embodiment but instead of this configuration, the biting portion 15 may be omitted. That is, the chisel-edge may not be thinned and only the chisel-edge is provided. In the case of this configuration, to enhance the biting performance into a workpiece, it is preferable that the above-described producing method of a cut product includes a step shown in FIG. 7 before the step shown in FIG. 5A .
- a producing method of a cut product according to another embodiment of the invention further includes a step of preparing a workpiece 100 ′ provided at a surface thereof with a prepared hole 102 having a diameter smaller than that of a front end portion of a drill 1 ′.
- the prepared hole 102 of this embodiment is constituted by a through hole which penetrates the workpiece 100 ′ between its front surface and back surface, but the invention is not limited to this configuration, and the workpiece 100 ′ can be provided at its surface with an opening.
- Other configuration is the same as that of the drill 1 and the producing method of a cut product according to the above-described embodiment.
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Abstract
Description
Claims (19)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2011262668A JP5823840B2 (en) | 2011-11-30 | 2011-11-30 | Drill and cutting method |
JP2011-262668 | 2011-11-30 |
Publications (2)
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US20130136552A1 US20130136552A1 (en) | 2013-05-30 |
US9623488B2 true US9623488B2 (en) | 2017-04-18 |
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US13/690,640 Active 2033-10-01 US9623488B2 (en) | 2011-11-30 | 2012-11-30 | Drill and method of manufacturing machined product |
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US (1) | US9623488B2 (en) |
JP (1) | JP5823840B2 (en) |
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US20180147641A1 (en) * | 2015-05-28 | 2018-05-31 | Kyocera Corporation | Drill and method of manufacturing machined product |
US10315257B2 (en) * | 2015-05-28 | 2019-06-11 | Kyocera Corporation | Drill and method of manufacturing machined product |
Also Published As
Publication number | Publication date |
---|---|
JP5823840B2 (en) | 2015-11-25 |
JP2013111733A (en) | 2013-06-10 |
US20130136552A1 (en) | 2013-05-30 |
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